Rotary disk bit



jio

Patented June 29, 1926.

Nrrso TES VICTOR YORKI OF LOS ANGELES, CALIFORNIA.

` ROTARY msx BIT.

Application inea May s,

My invention relates to the `art of drilling oil wells -bywhat is known as the rotary system in which a bit is secured to the bottom of a stringr of drill pipe which. is rotated by power applied usually at the den rick floor. The invention relates more particularly to 'the bit used in such drilling..

'These bits are of-various forms and this invention relates more particularly vto what is known as disk bits in which disks are used to do theactual cutting, these disks being so mounted that they are free to turn on ins carried by disk supporting members; luch disk bits tend to out around the periphery of a. hole lea-ving an upwardly p rojecting central core.` Due to this projecting core, disks cannot be used in certain types of geological structures.- v

Itis an object of my invention' to provide a disk bit with 4a cooperating central cutting member which operates upon thisy central core thus increasing' the field of usefulness of such a bit and making it possible to use itin format-ions to which it cannot at present be applied.

In the drilling of wells, and especially oil wells, it is desirable tokecp a record ot', the penetrated subterranean structure,'-this being done by'eniployinp; what vis known as ay core drill. This core drill has a core barrel provided therein and has cutting clements at the lower end thereof which sink the hole, leaving a central cylindrical core which extends into the core barrel. The core is raised to the surface with the core bit where it is removed therefrom and 4is kept as a record of the penetrated strata.

'It is a further object of my invention to provide means by' whichz coresv may be taken during the ordinary drillingt of the hole, thus obviating the necessity of using :separate devices for drilling' and core taking. This l accomplish by usiliglthe disk bit to cut the periphery of the hole about the -core which is then cutv and removed by a cooperating cutting means carried inside the disks'. This relieves the core taking' portion of the bit as the majority of the cutting is done by the disks. One of the objections to the present form of disk bit is the liability of the pins to become loosened thus releasing the disks. which fall into the bottom of the hole. The disks are of a very awkward shape so that when wedged in the bottom of the hole7 they cannot be readily vfished. The disks are usually made of It is an object of my invention tois'z. seriai No. 636,361.

.manganese steel and are b oth hard and tough so that they are very hard to drill up when so lost. i

provide means iii a disk bit 'for l cking the pins in place by anauxiliary central member.

Additional advantages of the: invention and further objects thereof will be made evident hereinafter. y

Referring to the drawing which is for illustrative purposes only:

,Fig. 1 is an elevational view of a disk drill embodyingr the features of the invention.

Fig'. 2 isa bottom view of the drill shown in Fig; 1.

' Fig. 3 is a perspective viewof a wrench which lniay be used for installing v'or removinlLY the core barrel.

' In' the forni of the invcntion'shown the disk bit 11 consists of head having ashank 12, which has al pin 14 at the upper end thereot for attacliment'to the drill pipe and having downwardly extending disk supportingr arms 1G formed integral at the lower end thereof. As shown in Fig. 2 the arms 1G are ofi'set so that the cutting edges l ofthe disks 17 which are rotatably mounted lon the inner sides ofthe arms 16 on the ins 18 will cuta hole represented by the brdken line 19. Screwed to the body 11 at 20 is a member 2l which is positioned'concentrically with the axis of rotation of the drill and which extends between the disks 17. 'lhcincniher 21 has teeth 22% at the lower end thereof for producing a core which will enter the central bore 24 of the member 21. The member 21 may be screwed to or unscrcwed from the body 11 by placing the 'cylindrical portion of the wrench 26 in the bore lil ot' the member 21 so that lugs 27 of the wrench 26 coincide with the slots 29 in the member 21 and by turning the wrench in the proper direction. Lubricatinor niud or water may be supplied to the cutters through the channels 31 provided therefor.

ln thc operation of thc ordinary disk bit, which consists of the members l1 to 19, as described above. there is av tendency to cut around the periphery of the hole, leavii'ig ,ir a central roughly cylindrical core projecting up inside the disks 17. This core may break off from time to time along the plane of the formation. but in s oine types of formation it may build up until it supports a,

considerable portion of the weight of the bit and pipe, thus limiting the cutting action ot' the bit. 4 The large cylindrical members formed by the cores also, when broken ott', tend tojam the disks 17 and interfere with the operation of thebit. l

By using the member 21 these cores are cut away at their base and fracturing along the plane of formation are withdrawn with the bit; thus preventing the formation of high cores or their presence in the well after they become detached. The cores .when removed give the drillc and geologist very valuable infoin'iation as to underground lcon-y ditions.

1.7. The member 21 also acts as a locking means for lthe pins 1R preventing them from backing out ol the varms 16 it' they become uuscrewed. i y

ll-'hrn the bit is removed from the well, the packed' core carried in the member .21 can be readily removed by unscreiving this member l'rom the shankl 12 by using the wrench 2t. l'he member 2l is of Substantially uniform bore, exrept for the small slots :il angl, a l'ter it is unscrewed from the shank l2, the core-can be readily pushed therel'rom.

l claim as my invention: 4

l. A disk bit comprising: a body adapted to be secured to a stringof drill pipe; arms formed on said body and projecting downwardly therefrom :.two pins, one threaded in, and projectinginwardly from the il'ner side ol one ol' said arms, and the other threaded in. and projecting inwardly from theinner side ofthe other ol' said arms; two disks, one tnrninglreely on one of said pins and the other turning freely on the other of said pins; and a stationary cylindrical locking member l'ietween the heads of said pins so placed as to prercntraid pins from un screwing. j A Y 2. A disk bit as in claim 1, in which said locking member is also secured to said body.

3. A disk bit as in claim 1, in'which said locking meinher comprises:` a member "in, and projecting inwardly from the inner side of one of said arms, and the other threaded in. and projecting inwardly from the inner side of' the otherV of said arms; two disks, one turning freely on one ofsaid pins and the other turning freely on the other of said pins; and a stationary' lock ing member between the heads of said pins j so placed as to prevent said pins from unserewing, said locking member consisting of a pipe centrally secured .to saidlbody. and projecting downwardly between said pins.

5. A disk bit as in claim 4, in which said pipe is provided with cutting surfaces at its lower end.

G. A disk bit comprisingi a body adapted to .be secured to a string of drill pipe; arms l'ormed on said body and projecting downwardly therefrom', two pins, one threaded in, and projecting inwardly from the inner side of one of said arms, and the other threaded in, and projecting inwardly from' theinner side of the other of said arms; twodisks, one'turning freely on one of-said pins and the other turning freely on the other of said pins; and a stationary locking member between the heads of said pins .so placed as to prcventfsaid pins 'from unscrewing, said locking Ymember consisting of a pipe centrally secured to'said body andI projecting downwardly between said pins, said pipe being provided with cuttingr surfaces at its lower end and being so secured in said body as to be readily removable tl'ieretrom.

In testimony whereotgl have hereunto set my hand at Los Angeles, California, this 27th day of April 1923;

VICTOR YORK.- 

